Golovkin stalked the game Irishman and finished the fight at 1:22 of the third round with a vicious left hook to Macklin's ribs, sending a strong signal to the entire 160-pound division that the Kazakh is a true force.
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Macklin stunned him for a second with a good shot when he fought fire with fire, perhaps enough to suggest that a heavy-punching 168lb fighter has a chance to beat Golovkin.

Otherwise he's right, it did look relatively easy.

Yes, I saw a right hand that caught Golovkin's attention and he even nodded before Macklin caught him again. Not that clean but still pretty hard and Golovkin stepped back. Macklin was in survival mode though.